Is there a solid fuse-like item that I can use in place of a fuse, to bypass it?

Many years ago, the cabal of fuse makers bribed the cabal of electrical gear manufacturers to install fuse holders.  IT IS A VAST CONSPIRACY.  I will shortly be selling an audiophile replacement bar to use in place of the fuse that has been blessed by Q himself (or herself, or itself).

If you think the fuse has that significant and adverse effect on the sound, such that it is worth risking the component and a fire, then don't stop short by just replacing the fuse--bypass the fuse holder by directly wiring the power cord to the internal wiring of the amp.  This would mean removing any IEC power cord plug as well.  Any kind of junction is, at least theoretically, a source of degraded transfer of power, so these should be removed along with the fuse and fuse holder.

Personally, I would NEVER remove something as fundamental to protecting gear and preventing fires as the fuse.  I consider this the first line of defense, and would only consider adding more, not less protection, such as surge protection, soft start, etc.

The fuses are there for protection, so I would not bypass them even if they are not high amperage circuits that are being fused.  Why risk ANY damage to the amp at all?  Clearly the designer thought it was important to protect these circuits and you would be second-guessing as to whether the designer was being overly cautious.

If you think it matters that much, bite the bullet and buy exotic fuses; don't by-pass them.